The Milwaukee SHOCKWAVE Impact Duty Right Angle Adapter features an Internal Optimized SHOCKZONE which absorbs peak torque and prevents breaking. The shanks are made from CUSTOM ALLOY76 Steel which is engineered for extended life. The hardened gears provide increased torque transfer for added durability. With only a 1.4 in. Slim Profile, the adapter allows access into the tightest of spaces. The SHOCKWAVE Impact Duty Right Angle Adapter is designed for use in both Impact Drivers and Drill Drivers and works with all 1/4 in. Hex Shank accessories. The set includes an Accessory Case Row for Bit storage as well as 8 SHOCKWAVE Impact Duty Insert Driver bits. The Milwaukee 21-piece Thunderbolt Black Oxide Drill Bit Set offers convenience and heavy-duty performance on the job site. These drill bits are designed for extreme durability and long-life. The Thunderbolt web features a thicker core to provide ultimate strength and protect against side-load breakage. Corrosion resistant coating provides lubricity and resists the corrosion of the tip. A specially designed parabolic flute form clears chips fast, while the 3-Flat Secure-Grip shank holds the drill bit firmly in the drill chuck. The 135 degree split point tip delivers a precision start and prevents walking for fast, accurate holes. The Milwaukee Thunderbolt Black Oxide bits are effective for drilling on curved surfaces and require less effort to drill through metal, wood and PVC.